Importance of Respiration Quiz - CBSE Class 7 Science

Free practice quiz: Importance of Respiration (CBSE Class 7 Science). 19 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

Sample questions

1. What is the primary function of respiration in living organisms?

   1. To produce energy
   2. To absorb light
   3. To facilitate growth
   4. To synthesize proteins
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   Answer: A. To produce energy

   Respiration is the process by which organisms convert glucose into energy. The primary function of respiration is to produce energy needed by cells to perform various functions.

2. What happens to glucose during cellular respiration?

   1. It is converted into oxygen
   2. It is broken down to release energy
   3. It is stored as fat
   4. It evaporates as gas
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   Answer: B. It is broken down to release energy

   During cellular respiration, glucose is broken down into smaller molecules such as pyruvate and eventually into carbon dioxide and water, releasing energy in the process.

3. What role do mitochondria play in cellular respiration?

   1. They serve as the nucleus of the cell
   2. They store genetic information
   3. They are the site of ATP production
   4. They transport nutrients across the cell
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   Answer: C. They are the site of ATP production

   Mitochondria are known as the powerhouse of the cell because they are the primary site where ATP is produced during aerobic respiration.

4. What is the main disadvantage of anaerobic respiration?

   1. It produces too much energy
   2. It requires sunlight
   3. It generates harmful byproducts
   4. It cannot occur in mammals
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   Answer: C. It generates harmful byproducts

   Anaerobic respiration can produce lactic acid in animals and alcohol in plants, both of which can be harmful or cause inefficiency compared to the more energy-efficient aerobic respiration

5. When glucose is broken down completely, what are the total usable energy units produced?

   1. 10 ATP molecules
   2. 36-38 ATP molecules
   3. 50 ATP molecules
   4. 100 ATP molecules
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   Answer: B. 36-38 ATP molecules

   In aerobic respiration, complete oxidation of one molecule of glucose typically yields about 36-38 molecules of ATP, depending on the efficiency and conditions.

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